Delinquency indicator of revolving arm type



1934. R. M. HOPKINS DELINQUENGY INDICATOR OF REVOLVING ARM TYPE Filed June 21. 19550 2 Sheets-Sheet l INVENTOR FwkardMH JZIKS WMQZL ORNEL Jan. 9, 1934. R HopKms 1,942,815

DELINQUENCY INDICATOR OF REVOLVING ARM TYPE Filed June 21, 1930 2 Sheets-Sheet 2 4M MM Patented Jan. 9, 1934 DELINQUENCY INDICATOR OF REVOLVING ARM TYPE Richard M. Hopkins, Rutherford, N. J., assignor to American District Telegraph Company, Jersey City, N. J., a corporation of New Jersey Application June 21, 1930. Serial No. 462,828

22 Claims.

This invention relates to delinquency indicators, and is intended primarily for use in connection with night-watchman supervisory-systems of the kind in which signals are sent to a distant or local central or head watchmans office, the function of such indicators being to sound a signal device in case the watchman does not start his rounds within a predetermined period of time or permits more than a predetermined period of time to elapse between rounds or be tween signals sent from individual stations.

It is noted, however, that the invention is not limited to delinquency or signal devices or to electrical devices.

One object of the invention is to provide a conveniently operated electrical apparatus of this kind suitable for installation in connection with systems already in use.

Another object of the invention is to provide an apparatus which may be made up wholly or in part of stock parts already on the market.

Another object of the invention is to provide an apparatus of this kind which is adjustable for periods of diiierent length.

Other objects of the invention are to improve generally the simplicity and efficiency of such apparatus and to provide a device or apparatus of this kind which is economical, durable and reliable in operation, and economical to manufacture.

Still other objects of the invention will appear as the description proceeds; and while herein details of the invention are described and claimed, the invention is not limited to these, since many and various changes may be made without departing from the scope of the invention as claimed in the broader claims.

The inventive features for the accomplishment of these and other objects are shown here in connection with two improved devices each of which, briefly stated, includes an arcuate bank of switch contacts engageable by a revolving contact arm at predetermined intervals advanced one contact. A signal device electrically connected to one or more contacts of said bank near the end of the bank is set off when such contacts are reached, as when the watchman fails to send in a signal on time.

In each form of the invention a watchmans station is provided with means to quickly restore the arm to an initial position, thereby to prevent the operation of the signal when he is properly in attendance.

While in this specification and claims mention is made of .delinquency alarms, signal devices and arms and it is stated that one part is moved relative to the other rather than vice versa, it is understood that this is for designa-- tion and description and that for purposes of protection the language is to be construed broadly enough to cover other equivalent means and devices in other relative arrangements, and in general all terms of the claims are to be given broad interpretation when necessary for purposes of protection.

In the accompanying drawings showing, by way of example, two of many possible embodiments of the invention,

Figs. 1 and 2 are diagrams showing the respective embodiments.

The apparatus of Fig. 1 will first be very briefly described, and then will be described more in detail.

The apparatus of Fig. 1 comprises primary and signal contact members or arms 36, 38, and stepby-step means 10 to 29 whereby said members are continually advanced one step each minute.

A reset means 40, 46 normally electrically charges the primary member through conductor 48 from the source 10. A primary contact 53 engaged at the end of 19 minutes by the primary member 36 near the end of the cycle sets in operation locking-in means 50, 55, 37, 60, for, after other lapses of time, charging the signal arm 38, which will, if not prevented by the watchman, electrically operate a signal alarm device 77 when an arm 38 reaches contacts '75.

If the signal is set oil, the signal arm 38 after the signal device is operated engages the contact 88 for energizing the reset means 40, 46 to cause the reset means to decharge said arms 36, 38 and disable the locking-in means 50, 55, 60, 65.

Stepping means 94, 95, 96, 27 controlled by said reset means 40, 46 when thus energized quickly advance the arms to the end of the cycle, the reset means comprising a locking-in relay 41, 90, which is locked-in by current passing through 86, 87, 85, 35, 91, 92 while the stepping means is operating.

If, however, the watchman sends his signal on time, before the alarm 77 is sounded, he operates the station 106, which energizes the relay 40, and steps the arms quickly, past the alarm-operating contacts 75, to the end of the cycle as above explained.

Now the apparatus of Fig. 1 will be described in detail.

Step-by-step mechanism The form of delinquency alarm apparatus of Fig. 1 comprises, as shown, a source of current conventionally shown at 10, and having one terminal grounded as at 11 and the other terminal 12 ungrounded.

A motor electromagnet 15 and a normally open minute contact switch 16 are connected by conductors 17, 18, 19 in series between said ungrounded terminal 12 and a ground 20.

Ivlinute-contact means conventionally indicated at 21 are provided for closing said switch once at intervals, for instance, once each minute, whereby said motor magnet is energized once each minute. This contact means 21 may be conveniently operated from a master clock of a time clock system.

The condenser 22 shunted parallel to the solenoid is provided to decrease the length of the spark gap across the minute switch.

A pivoted armature 25 attracted by said magnet carries an operating arm 26 carrying a pivoted pawl 27, engaging a ratchet wheel 28 carried on a shaft 29.

Switch contact banks Said shaft is coaxial with a plurality of semicircumferentially coaxially arranged reset, primary, secondary and tertiary banks 30, 31, 32, 33 of insulated closely spaced timing switch contacts.

Said shaft carries a plurality of insulated pairs of oppositely radially extending contact members or arms 35, 36, 37, 38, one pair for each bank, fast on said shaft and engageable with the associated contacts respectively; and said pawl engages said ratchet whereby said contact arms are moved from one contact to the next each time said magnet 15 is energized.

The reset relay Current supplied to said arms is controlled by a normally deenergized reset relay 40 comprising a reset magnet 41, shown with one coil-end grounded as at 42, and a double-throw switch 44, 45, 46 having normally engaged and normally disengaged contacts 44, and a movable element 46 controlled at times by an armature 4'7 attracted by the reset magnet 41, the element 46 being connected to said ungrounded terminal 12.

A main conductor 48 connects the normally engaged contact 40 to the contact arms 36 of the primary bank.

Locking in relays A primary locking-in relay 50 shown with one solenoid end grounded, is shown with the other solenoid end connected by conductors 51, 52 to, for instance, the next to the last contact 53 of the primary bank, whereby when said next to the last contact is engaged by contact arm 36, due to continued action of the motor magnet, current passes through said contact 44 of the double throw switch, the contact arm 36 of the primary bank, said next to the last contact 53, the primary relay 50 to the ground.

A normally open locking-in switch 54 and a secondary bank switch 55 are closable by the primary relay armature 56 and each has its movable element connected by conductors 57, 56, 59 to said main conductor 48.

The fixed element of the locking-in switch 54 is connected by a conductor 51, the ungrounded terminal of the primary relay, whereby when the arm 36 engages the contact 53 and the relay is thereby energized, current will flow from the main conductor through conductors 57, 59 and the relay solenoid to the ground, thus locking-in the switch 52 until said double throw switch 44, 45, 46 acts to cut off the current from the main conductor 48, as will be later explained.

The fixed element of the secondary bank switch 55 is electrically connected to the contact arm 37 of the secondary bank, whereby said arm is charged so long as the primary relay remains closed.

A grounded secondary locking-in relay 60 has its ungrounded solenoid end connected by a conductor 61, 62 to the third to the last contact 63 of the secondary bank, and the movable element of its locking-in switch 64 connected by the conductor 59 to the main conductor 48.

Said secondary relay has a normally open tertiary bank switch 65 having one element electrically connected by a conductor 68 to the arms 38 of the tertiary bank, and the other element electrically connected by a conductor 69 to the ungrounded current-source terminal 12.

The alarm signal A group of electrically connected adjacent contacts of the tertiary bank two or more less remote from the end than the contact 63 of the secondary bank is connected by a conductor 76 with a bell or other alarm signal device 77 having one terminal grounded as at 78.

When the tertiary bank arm 38 reaches said group 75, current from the source 10, passes through conductor 69, switch 65, arm 38, a contact of said group and sounds the alarm until the contact arm leaves the group.

As shown relay 50 operates near the end of the first cycle or half turn of the shaft; the relay 60 near the end of the second half turn, and the alarm about midway of the third half turn.

Automatic reset means A reset contact 80 nearer the end of the tertiary bank than said group '75 and less near the end than said contact 63 is connected by a conductor 81, 82 to the ungrounded end of the reset solenoid 41, whereby the reset solenoid is energized immediately after the alarm, and the movable element 46 of the double throw switch is disengaged from the normally engaged contact 44 thereby to deenergize, and release to normal position, the primary and secondary relays 50 5 and 60.

Conductors 85, 86 connect contacts 87, all except the last contact 88 of the reset blank to the Lmgrounded terminal 12 of the current source; and a normally open locking-in switch 90, closable by the reset relay magnet 41, has one element connected by a reset conductor 91 to the contact arm 35 of the reset bank and the other grounded through conductor 92 and the relay solenoid 41, whereby when the relay magnet is energized the reset relay is locked in whenever the reset bank contact arm is not on the last contact 88. This locking-in is accomplished by current from the source through conductors 86, 87 arm 35, conductor 91, switch 90, conductor 92, solenoid 41 and grounds 42 and 11.

During this locking-in, current passes through the terminal 12, element 46, contact 45 and conductor 94, a normally closed stepping switch 94,

95 adapted to be opened by the motor magnet armature 26 and having its element 96 groiuided,

96" and motor armature vibrate until reset contact arm reaches the last contact 88, which is the end of a cycle and the beginning position of the new cycle.

Watchmans transmitting station A watchmans station comprising signal trans mitter 100' having a normally closed signal-wheel operated switch 101, 102, 103 having an element 102 connected by a conductor 104 to said ungrounded current-source terminal 12, and the other element 103 grounded through conductor 105.

A pair of relays 106', 107 have their solenoids 108, 109 interposed in, said conductors 104 and 105 in circuit with said switch, the relay 106 controlling a distant alarm or central station signal, the other relay 107 comprising a normally open switch 110, 11.1 adapted to be closed when the relay magnet is de-energized and having its elements I10, 111 respectively connected by a conductor 112 to said reset conductor 91, and by conductors 82, 92 to the reset switch 90, whereby when the station transmitter 100 is operated while a reset contact arm 35 is on one of the charged contacts 87, current passes through, and locks-in, the reset relay, causes the primary and secondary relays to be deenergized and assume normal position, and causes the arm 35 to be stepped to the end of the cycle. Any desired number of stations 100 may be provided.

Also the invention is not limited to the number of arms 35 to 38 of each bank. While these arms are shown in pairs, rather than one or more than two, it is obvious that the invention is not thus limited.

The operation The apparatus of Fig. 1, may be operated as follows:

Minute impulses supplied by a time clock system, close the switch 16 once each minute, thus moving the ratchet wheel 28 one tooth, and all the arms 35 to 38 one contact, once each minute. As there are twenty contacts to each bank 30 to 33, the arm 36 will pass from the initial position (as shown) to contact 53 in 19 minutes.

At this instant the arms 37 and 38 will be on the next to the last contacts, which are always uncharged, and current may pass through conductor 48, arm 36, contact 53, relay 50, thus attracting the armature 56, and locking in the relay 50, so that the arm 37 is charged through the switch 55, and conductors 58, 59, 48. But it a is noted that the arm 37 is on the next to the last contact, a dead contact; and that the relay is open as shown, so that the arms 38 are not charged.

The step-by-step movement now continues for 19 minutes more, and the charged arm 37 engages the contact 63, thus energizing and locking in the relay 60, with the switch closed so that the arm 38 becomes charged through conductors 68, 69 and switch 65.

Arms 36 and 38 are now on dead contacts three from the end. The next step brings an arm 36 to contact 53, but as the relay 50 is already lockedin, no change takes place.

Twelve minutes after the arm 37 has engaged j the contact 63, a now charged arm 38 will engage the first of the groups 75, and current will pass through conductor 76, bell 77 and ground 78, and the alarm will sound until the arm 38 leaves such group.

The various contacts: 53., 63 and are selected.

to be of such location that the periods between alarms willlbe of the desired length, and in so selecting the locations of the contacts 75', it may be, as in the present instance, that there are six contacts or 30 minutes, from. the last contact- 75 to the end of the cycle. It is desired thatthearms be quickly advanced to the end of the cycle.

Automatic operation of the reset means Immediately after the last contact 75 is engaged, the charged arm 38 engages the contact. 80, whereupon current passes through the conductors 81, 82, relay 40 and ground 42, thus energizing the magnet 41', disengaging contact 44, decharging arms 36.38,.deenergizing and unlocking relays 50 and 60, leaving these ready for the next cycle.

At the same time, the switch 90 is closed, thus permitting current to pass through conductors 86, 87, arm 35, conductor 91, switch 90, conductors 92, 82, solenoid 41 and ground 42,. thus locking in the relay 40. This locking-in causes current to pass through the movable element 46, contact 45, conductor 94, switch 95, 96, armature arm 26, armature 25, conductors 97, 18, solenoid 15, conductor 19. and ground 20, thus vibrating the arm 26 and pawl 27 and at the end of the cycle unlocks the relay 40 by cutting ofi the current supplied thereto through conductors 86' and 91.

Reset by watchmans station If the watchman, however, should in making his rounds send in his signal from the station transmitter 100 before the charged arm 38 reaches the reset contact 80, the switch 101, 102, 103 would be opened, the solenoid 109 deenergized, and the switch 110, 111 closed, thus sending current through conductors 86, 85, arm 35, conductors 91, 112, switch 110, 111, conductor 82, solenoid 41 and ground 42, thus energizing and locking-in the relay 40, and advancing the arms to the end of the cycle, as above described.

The apparatus of Fig. 2

The delinquency alarm apparatus of Fig. 2 comprises a shaft 29', a reset bank 30, a signal bank 33 and reset and signal arms 35 and 38, similar to the apparatus of Fig. 1.

The structure and operation of parts 10 to 28 are the same as in Fig. 1.

The two banks 31 and 32 of Fig. 1 are omitted in the apparatus of Fig. 2. A conductor 124 connects to the ungrounded terminal 12', a group of adjacent signal contacts 75 of the timing or .ignal switch bank 33 one or more remote from the end of the bank, while the alarm signal de-- vice 77 has one terminal grounded at 78 and the ether electrically connected by a conductor 76 to the timing contact arm 38, whereby when the arm 38 reaches said group 75' current from the source 10 passes through said arm 38 and one of the group 75' and sounds the alarm until said' contact arm leaves the group.

Obviously the group 75' could be connected to the alarm, as in Fig. 1,-and the arm 38 to the current source.

The reset means A normally deenergized reset relay 40" comprises a reset magnet 41 having one coil-end grounded at 42.

Conductors 85, 86 connect all except the last contact of the reset bank 30 to the ungrounded terminal 12 of the current source.

A normally open locking-in switch closable by the reset relay magnet, has one element connected to the reset conductor 91 and the other grounded through the solenoid 41, whereby when the relay magnet is energized current flows through conductors 86, 87, 91 and reset solenoid, whereby the reset relay is locked in until the reset bank contact arm reaches the last contact. A normally open reset-switch 45, 46 is closable by the reset magnet and serves to operate the stepping switch 95, 96 as in Fig. 1.

The watchmans station The reset relay 40 is not automatically energized as in Fig. 1, but is energized from the watchmans station 100 constructed and operated as in Fig. 1, whereby when the watchmans station is operated while the reset contact arm 35 is on one of the charged contacts 87, the reset switch 44, 45 will be locked-in and the stepping switch and motor armature 26 will vibrate until reset contact arm 35 reaches the last contact 88 and the end of the cycle.

Operation of the apparatus of Fig. 2

The apparatus of Fig. 2 is much simpler than that of Fig. 1, and the cycle period much shorter being here shown as only 12 minutes and being limited to one cycle. In this case, the arms 35, 38 are advanced once each minute as in Fig. 1, and in 12 minutes a contact 75 is engaged causing current to pass through conductor 124, arm 38, conductor '76, the signal device '77 and ground 78.

In this case, however, the arms are not automatically advanced to the end of the banks 30, 33, but continue to advance by steps once each minute until the alarm goes off fifteen minutes later, unless the station 100 is operated.

When the station is operated, the solenoid 109 is deenergized, and the solenoid 41 is energized, and the arms are stepped around until the contact 88 is engaged at the end of the cycle.

Figs. 1 and 2 are very diagrammatic, and in practice the contact banks may be closely spaced side by side; any reasonable number of stations 100 may be used. and the connections to the contacts of the banks may be adjusted to give any desired duration of silent and alarm periods within the limits of the apparatus.

I claim as my invention:

1. A signal apparatus comprising a movable member; means whereby said member is continually cyclically advanced; a single device set in operation by said member intermediately of the cycle; reset means automatically set in operation after the signal device is operated to quickly advance the member to the end of the cycle; and means for at will operating the reset means.

2. An apparatus comprising a movable member; means whereby said member is continually cyclically advanced; a translating device set in operation by said member intermediately of a cycle; and means automatically set in operation after the translating device is operated to quickly advance the member to the end of the cycle.

3. An apparatus comprising a movable member; means whereby said member is continually cyclically advanced; a translating device set in operation by said member intermediately of 2. cycle; means automatically set in operation after said device is operated to quickly advance the member to the end of the cycle; and means for at will quickly advancing the member to the end of the cycle.

4. A signal apparatus comprising a contact member; means whereby said member is continually cyclically advanced; means to electrically charge the member; a signal device set in operation by the charged contact member intermediately of the cycle; reset means automatically set in operation after the signal device is operated to decharge said member and to quickly advance the member to the end of the cycle; and means for at will operating the reset means.

5. A signal apparatus comprising a movable member and a reset member; means whereby said members are correspondingly continually cyclically advanced; a signal device set in operation by said movable member intermediately of a cycle; a reset relay automatically energized after the signal device is operated; one or more electrically charged reset contacts engaged by the reset member except at the end of the cycle, to charge said reset member; means electrically connected to the reset member for locking in the reset relay when energized when the reset member is charged; means controlled by said reset relay when locked-in to quickly advance members to the end of the cycle; and means for at will energizing the reset relay.

6. A signal apparatus comprising primary and signal contact members; means whereby said members are continually correspondingly cyclically advanced; a primary contact engaged by the primary member near the end of the cylce; means to electrically charge the primary member; locking-in means set in operation by the charged primary contact for electrically charging the signal member; and a signal device electrically operated from the charged signal member.

7. An apparatus comprising primary and signal contact members; means whereby said members are advanced; a primary contact engaged by the primary member near the end of the cycle; means to electrically charge the primary member; means set in operation by the charged primary contact for charging the signal member; and a signal device electrically operated from the charged signal member.

8. A signal apparatus comprising primary and signal contact members; means whereby said members are continually correspondingly cyclically advanced; a primary contact engaged by the primary member near the end of the cycle; a reset means to normally electrically charge the primary member; locking-in means set in operation by the charged primary contact for charging the signal member; a signal device electrically operated from the charged signal member; means set in operation by the signal member after the signal device is operated for operating the reset means to cause the reset means to decharge said contact members and disable the locking-in means; means controlled by said reset means when thus operated to quickly advance the contact members to the end of the cycle; and means for at will operating the reset means.

9. A signal apparatus comprising primary, secondary and tertiary contact arms, means whereby said arms are continually correspondingly cyclically advanced; a primary contact engaged by the primary arm near the end of the cycle; a secondary contact engaged by the secondary arm just before the primary contact is engaged; primary and secondary locking-in relays respectively electrically connected to said primary and secondary contacts; a normally deenergized reset relay; means controlled by the reset relay when de-energized to electrically charge the arm of the primary bank and an element of each locking-in relay switch whereby each locking-in-relay is locked in; means operated by the locking-in relays when locked in for charging the secondary and tertiary arms respectively; a reset contact engaged by the tertiary arm before the secondary contact is engaged; a signal contact engaged by the tertiary arm before the signal arm is engaged; a signal device electrically operated from the signal contact; means connecting the reset contact to the reset relay to energize the latter to decharge the locking-inrelay switches and said arms; means actuated by the reset relay when energized to quickly advance all arms to the end of the cycle; and means for at will energizing the reset relay.

10. A delinquency alarm apparatus comprising an arcuate bank of switch contacts; a contact arm bank engageable with said contacts; means whereby said arms are at intervals correspondingly advanced one contact at a time; a signal device electrically connected to a predetermined contact of said bank intermediately of the ends of the bank; a reset means; a contact nearer the end of the bank than said predetermined contact being connected to' the reset means to operate the latter; means to cause the reset means to quickly restore the arm to an initial position; and means for at will operating the reset means.

11. A delinquency alarm apparatus comprising an arcuate bank of switch contacts; a revoluble contact arm bank engageable with said contacts; means whereby said arms are at intervals correspondingly cyclically advanced one contact at a time; a signal device electrically connected to one or more predetermined contacts of said bank away from the end of the cycle; a reset means; a contact nearer the end of the bank than said predetermined contacts being connected to the reset means to operate the latter; means to cause the reset means when operated to quickly advance the arm to the end of the cycle; and means for at will operating the reset means.

12. A signal apparatus comprising reset, primary and signal movable contact members; means whereby said members are continually correspondingly cyclically advanced; a primary contact engaged by the primary member near the end of the cycle; a normally deenergized reset relay connected to normally electrically charge the primary member; locking-in means set in operation by the charged primary contact for charging the signal arm; a signal device electrically operated from the signal member when charged in a predetermined position; means set in operation by the signal member after the signal device is operated for energizing the reset relay; means to cause the energized reset relay to decharge said arms and disable the locking-in means; one or more reset contacts engaged by the reset member except at the end of the cycle; means electrically charging the reset contacts; means electrically connected to the reset member for locking in the reset relay when energized when said member engages the reset contact; means controlled by said reset relay when locked in to advance all said members to the end of the cycle and means for at will energizing the reset relay.

13. A delinquency alarm apparatus comprising reset, primary, secondary and tertiary banks of switch contacts; contact arms, one for each bank; means whereby said arms are at intervals correspondingly advanced one contact; primary and secondary locking-in relays; a normally deenergized reset relay; means controlled by the reset relay when de-energized to electrically charge the arm of the primary bank and an element of each locking-in-relay switch; means whereby said locking-in-relays are respectively energized from predetermined primary and secondary relay operating contacts located progressively more remote from the end of the banks, whereby each locking-in-relay is locked in; means operated by the locking in relays when locked in for charging the secondary and tertiary bank arms respectively; a signal device electrically operated from one or more signal contacts of the tertiary bank more remote from the end than said predetermined contacts; means set in operation by the tertiary arm after the signal device is operated for energizing the reset relay to cause the reset means to decharge said arms and release the locking-in means; means controlled by said reset relay when thus energized to quickly advance the arms to the end of the cycle; and means for at will energizing the reset relay.

14. An apparatus comprising a movable member; means operable by electric impulses whereby said member is slowly advanced step-by-step; means for supplying such impulses; a translating device set in operation by said member after the member has moved a predetermined distance;

reset means automatically set in operation after said device is operated to restore the member to initial position; and means for at will operating the reset means.

15. An apparatus comprising primary and signal contact members; means whereby said members are advanced; a primary contact engaged by the primary member after a period of advance from an initial position; means to electrically charge the primary member; means set in operation by the charged primary contact for charging the signal member; a signal device electrically operated from the charged signal member after a period of advance after said charging; and means to quickly move said members to a position equivalent in effect to said initial position.

16. An apparatus comprising movable primary and secondary contact members; means for ad vancing said movable members; a stationary primary contact member positioned for engagement with the movable primary member after a period of advance of the latter from its initial position; a stationary secondary contact positioned for engagement with the movable secondary member after a period of advance of the latter remote from its initial position; an alarm means; and electric means set in operation by the cooperation of said engagements for operating said alarm means.

17. An apparatus comprising movable primary and secondary contact members; means for advancing said movable members; a stationary primary contact member engageable with the movable primary member after a period of admeans for '5 members, when engaged in circuit, with the alarm means, for operating the latter.

18. A signal apparatus comprising a movable member; means whereby said member is continually cyclically advanced; a signal device set in operation by said member intermediately of the cycle; a signal transmitter remote from the movable member; and means set in operation by said transmitter for automatically resetting the movable member to the end of the cycle every time the transmitter is operated.

19. A signal apparatus comprising a movable member; means whereby said member is continually cyclically advanced; a signal device set in operation by said member intermediately of the cycle; reset means to quickly advance the member to the end of the cycle; a signal transmitter remote from the movable member; and means set in operation by said transmitter for operating the reset means.

20. An apparatus comprising a pair of movable contact members; means for continually advancing said movable members; a pair of stationary contact members positioned for engagement with the movable members respectively while the latter are advanced from their initial positions; an alarm means; electric means set in operation by the cooperation of said engagements for operating said alarm means; and means for automatically restoring the movable membersto initial position every time the alarm is operated.

21. An apparatus comprising a pair of movable contact members; means for continually advancing said movable members; a pair of stationary contact members positioned for engagement with the movable members respectively while the latter are advanced from their initial positions; an alarm means; electric means set in operation by the cooperation of said engagements for operating said alarm means; and means for at will restoring the movable members to initial position before the alarm is operated.

22. An apparatus comprising primary and secondary movable members; means for slowly advancing said movable members to respective predetermined positions a plurality of times; an alarm means; means for cooperating with said movable members only after said primary member had moved to its predetermined position more than once, and said secondary member has moved to its predetermined position at least once, for operating the alarm; means for automatically restoring the movable members to initial position every time the alarm is operated; means for at will restoring the movable members to initial position before the alarm is operated,

RICHARD M. HOPKINS. 

